The Type D pressure reducing valves are high performance valves specifically designed to optimise the stringent requirements of the fluids handling industry. Principal features include high capacity, balanced internal parts which permit fluctuating inlet pressures and ensure a stable downstream pressure. Tight shut off results under no flow conditions. The Type D, by virtue of its inherent advanced design, yet simplicity, and a minimum of moving parts, provides maximum service life, reliability and accuracy of control. The Type D is also a WRAS - Approved Product, in sizes two and half inch to six inch.
Valves are supplied in sizes half inch to six inch in SG Iron, Bronze, Stainless Steel or materials to suit the process requirements, with ends screwed female or alternatively flanged to customers requirements. Inlet pressures of up to 20.0 Barg can be accommodated, reduced pressure ranges of 0.35 - 13.8 Barg are possible. The maximum working temperature of the type D is 100 Degrees C
Specification
All valves are supplied with a nitrile disc and seals for liquids as standard, but other materials are available on request.
Description of Action
High pressure is admitted to the underside of the disc valve. The spring is then compressed the requisite amount and the valve opened permitting pressure to pass to the service side. Expansion and consequent reduction of pressure takes place as it leaves the valve orifice and the reduced pressure is then controlled by the reaction of the spring to the reduced pressure acting upon the area of the piston. If the reduced pressure tends to fall, the spring, through the medium of the diaphragm, opens the valve and increases the orifice area. Conversely, if the pressure rises the valve closes until the required downstream pressure is restored; uniformity of the reduced pressure is thereby maintained within very close limits.
The reduced pressure can be varied to requirements by compressing or relaxing the spring. The adjusting screw is provided for this purpose. Compressing the spring increases the reduced pressure, relaxing the spring decreases the reduced pressure.
Installation Instructions
All valves should be fitted in a horizontal pipeline with, flow in the direction of the arrow cast on the side of the body. The adjusting screw should be directly above or below the pipeline. The pipe must be clean and free from dirt, scale, etc. It is advisable to fit a stop valve on the high pressure side of the line. A relief valve should always be fitted where dead end conditions apply
Maintenance Information
Contact Sales for more information.
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Broady Flow Control Limited
English Street, Kingston upon Hull, East Yorkshire, HU3 2DU
Tel: 44 (0) 1482 619601 Fax: 44 (0) 1482 619701
